Buffer

Observable.Buffer()
Observable.Buffer<TSource, TBufferOpening, TBufferClosing>(IObservable<TSource>, IObservable<TBufferOpening>, Func<TBufferOpening, IObservable<TBufferClosing>>)
Observable.Buffer<TSource>(IObservable<TSource>, TimeSpan, TimeSpan, IScheduler)
Qbservable.Buffer()
Qbservable.Buffer<TSource, TBufferClosing>(IQbservable<TSource>, Expression<Func<IObservable<TBufferClosing>>>)
Qbservable.Buffer<TSource>(IQbservable<TSource>, TimeSpan, IScheduler)